Fergusons Lectures On Select Subjects in Mechanics Hydrostatics Hydraulics P
Fergusons Lectures On Select Subjects in Mechanics Hydrostatics Hydraulics P
James Ferguson
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A u 370 MECHANICS. "Ti .. And ==l, and v be denoted by 1, 2, 3, 4, 5, &c. The corresponding absolute intensity will be % ?\/ 2 > or \/ 2 1? y/20 . Y/30 ' 204-^/320' 17. If the accurate value of p be substituted in the expression *jrrr- f r l he compamtive in- u* l f v/(v a 4-v tensity, we obtain f _ . . T? - 7 u> V2t> + 2 -f 2 >/ x Suppose wir 7 and v successively =r 1, 2, 3, 4, 5, &c. Then the measure of the effect will be V 2 or q /fi ~ V ' __ _ 244. ^432 -f v'l 2>40 -f V 1 2804- /W?Q+ -V/30O...O+ v^25 &c. Let v be a large number, the proxi- mate measure of the effect will then be z: -, ,. or ; and thls expres " sion will be ultimately rrf. Wherefore, com- paring this result with that in art. 1 2, it appears, that, in whatever way the maximum be procur- ed, the force which impels the weight can never amount to one fourth part of the direct action of the power, 1 8. Hitherto we have not taken into account the force expended in impressing motion upon the parts of the machine which connect the power and weight.
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